WO2012094877A1 - 空间流向空时流映射的方法、装置及数据传输方法、装置 - Google Patents
空间流向空时流映射的方法、装置及数据传输方法、装置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0625—Transmitter arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
Definitions
- the present invention relates to the field of communications, and in particular to a method, an apparatus, and a data transmission method and apparatus for spatially flowing to space-time flow mapping.
- WLANs Wireless Local Area Networks
- IEEE802.il is one of the mainstream technologies of wireless LAN. This protocol mainly specifies the physical layer PHY and media access control MAC layer specifications.
- WLAN went through 802.11 to 802.11b to 802. Ha/g, then 802.11n, and finally
- 802.11ac As people's demand for wireless networks increases, the information capacity requirements for wireless communication systems are also increasing. For a typical 802.1 lac ultra-high-throughput WLAN system, up to eight streams can be supported for data transmission. To improve performance, space-time coding can be used by setting the system's hollow time coding indicator. In this case, an even number of nulls can be used. The time stream (that is, the number of empty time streams is 2, 4, 6, 8) is used for data transmission. However, for a typical 802.11ac ultra-high-throughput WLAN system, there is no specific method for space-time to space-time flow mapping using space-time coding.
- the present invention is directed to a method, apparatus, and data transmission method and apparatus for spatially flowing to space-time flow mapping, to solve the problem in the related art that a space-time coding is not currently used for a typical 802.1 lac ultra-high-throughput WLAN system.
- the problem of a specific method of spatially flowing to space-time flow mapping is not currently used for a typical 802.1 lac ultra-high-throughput WLAN system.
- Mapping the OFDM symbol carried by the nth spatial stream 7 to the 2n-l space-time OFDM symbols includes: placing the M OFDM symbols carried in the nth spatial space in the nth space The order of the sequences in the stream is sequentially mapped to the M OFDM symbols of the 2n-1th space-time stream.
- the number of spatial streams in the network is 3
- the M OFDM symbols carried by the three spatial streams are respectively mapped to the six space-time streams.
- mapping the M OFDM symbols carried by the three spatial streams to the six space-time streams respectively including: pressing the M OFDM symbols carried by the first spatial stream The original order of the OFDM symbols is sequentially mapped to the M OFDM symbols of the first space-time stream; the second OFDM symbol carried by the first spatial stream takes the opposite of the conjugate to the second space-time stream.
- the first OFDM symbol carried by the first spatial stream 7 is conjugate-mapped to the second OFDM symbol of the second space-time stream, and the first spatial stream 7
- the fourth OFDM symbol carried by the conjugate is mapped to the third OFDM symbol of the second space-time stream, and the third OFDM symbol of the first spatial stream is conjugated to the second OFDM symbol.
- the M-1th OFDM symbol carried by the first spatial stream 7 is conjugate-mapped to the Mth OFDM symbol of the second space-time stream.
- the second space-time stream is obtained; the M OFDM symbols carried by the second spatial stream 7 are sequentially mapped to the M OFDM symbols of the third space-time stream in the original order of the OFDM symbol;
- the second OFDM symbol carried by the spatial stream 7 takes the opposite number of the conjugate and is mapped to the first OFDM symbol of the fourth space-time stream, and the first OFDM symbol of the second spatial stream is taken as a common OFDM symbol.
- the third OFDM symbol carried by the second spatial stream 7 is conjugate-mapped to the fourth OFDM symbol of the fourth space-time stream, according to the M of the spatial stream.
- OFDM symbol two-two crossover operation method, ⁇ ! The M-th OFDM symbol carried by the second spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the fourth space-time stream, where the second spatial stream.
- the M-1 OFDM symbols are mapped to the Mth OFDM symbol of the 4th space-time stream to obtain a 4th space-time stream; and the M OFDM symbols carried by the 3rd spatial stream 7 are OFDM symbols.
- the original sequence is sequentially mapped to the M OFDM symbols of the fifth space-time stream; the second OFDM symbol carried by the third spatial stream takes the inverse of the conjugate and maps to the first of the sixth space-time stream.
- the first OFDM symbol carried by the third spatial stream 7 is conjugate mapped to the second OFDM symbol of the sixth space-time stream, and the third spatial stream 7 carries the first OFDM symbol.
- the M OFDM symbols of the spatial stream are two-two-crossing operation method, ⁇ !
- the M-th OFDM symbol carried by the third spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the sixth space-time stream, where the third spatial stream
- the M-1 OFDM symbols are conjugate mapped onto the Mth OFDM symbol of the sixth space-time stream to obtain a sixth space-time stream.
- the M orthogonal frequency division multiplexing OFDM symbols of each of the four spatial streams are respectively mapped to eight space-time streams.
- the M OFDM symbols carried by the four spatial streams are respectively mapped to the eight space-time streams, including: pressing the M OFDM symbols carried by the first spatial stream The original order of the OFDM symbols is sequentially mapped to the M OFDM symbols of the first space-time stream; the second OFDM symbol carried by the first spatial stream takes the inverse of the conjugate and maps to the second space-time stream.
- the first OFDM symbol carried by the first spatial stream 7 is conjugate-mapped to the second OFDM symbol of the second space-time stream, and the first spatial stream 7
- the fourth OFDM symbol carried by the conjugate is mapped to the third OFDM symbol of the second space-time stream, and the third OFDM symbol of the first spatial stream is conjugated to the second OFDM symbol.
- the first spatial stream 7 carries The M-1 OFDM symbols are conjugate mapped to the Mth OFDM symbol of the second space-time stream to obtain a second space-time stream; and the M OFDM symbols carried by the second spatial stream 7 are OFDM symbols.
- the original order is sequentially mapped to the M OFDM symbols of the third space-time stream; the second OFDM symbol of the second spatial stream takes the inverse of the conjugate and maps to the first of the fourth space-time stream.
- the first OFDM symbol carried in the second spatial stream is mapped to the second OFDM symbol of the fourth space-time stream, and the fourth spatial stream carries the fourth OFDM symbol.
- OFDM symbols take the opposite of the conjugate to map to
- the third OFDM symbol carried by the second spatial stream 7 is conjugate-mapped to the fourth OFDM symbol of the fourth space-time stream, according to the M OFDM symbol pairwise operation method for spatial stream, ⁇ !
- the M-th OFDM symbol carried by the second spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the fourth space-time stream, where the second spatial stream
- the M-1 OFDM symbols are mapped to the Mth OFDM symbol of the 4th space-time stream to obtain a 4th space-time stream
- the M OFDM symbols carried by the 3rd spatial stream 7 are OFDM symbols.
- the original sequence is sequentially mapped to the M OFDM symbols of the fifth space-time stream
- the second OFDM symbol carried by the third spatial stream takes the inverse of the conjugate and maps to the first of the sixth space-time stream.
- the first OFDM symbol carried by the third spatial stream 7 is conjugate mapped to the second OFDM symbol of the sixth space-time stream, and the fourth spatial stream carries the fourth OFDM symbol.
- the OFDM symbol takes the inverse of the conjugate to the third OFDM symbol of the sixth space-time stream, and the third OFDM symbol of the third spatial stream 7 takes the conjugate to the sixth space.
- the M OFDM symbols of the spatial stream are two-two-crossing operation method, ⁇ !
- the original order is sequentially mapped to the M OFDM symbols of the 7th space-time stream; the 2nd OFDM symbol of the 4th spatial stream takes the opposite of the conjugate to the 8th space-time stream On the 1 OFDM symbol, the 1st OFDM symbol carried in the 4th spatial stream is mapped to the 2nd OFDM symbol of the 8th space-time stream, and the 4th spatial stream carries the 4th OFDM symbol.
- the OFDM symbol takes the opposite of the conjugate and maps to the 3rd OFDM symbol of the 8th space-time stream, and the 3rd OFDM symbol of the 4th spatial stream 7 takes the conjugate to the 8th space-time And mapping, on the fourth OFDM symbol of the stream, the inverse of the conjugate of the Mth OFDM symbol carried in the fourth spatial stream to the 8th according to the method of calculating the M OFDM symbols of the spatial stream Empty time On the M-1th OFDM symbol of the stream, the M-1th OFDM symbol of the 4th spatial stream is mapped to the Mth OFDM symbol of the 8th space-time stream, and the 8th is obtained. Space time flow.
- the method After determining, according to the space-time coding indicator bit in the network, whether space-time coding is used, the method includes: when the determination result is no, the M OFDM symbols carried by the n-th spatial stream are in the n-th spatial stream. The order of the order is sequentially mapped to the Mth OFDM symbol of the nth space-time stream.
- the number of OFDM symbols, and M is an even number greater than zero.
- the first mapping module is further configured to map the M OFDM symbols carried by the nth spatial stream to the M OFDM symbols of the 2n-1th space-time stream in the order of their arrangement in the nth spatial stream. .
- the first mapping module is further configured to map the opposite number of the conjugate of the 2m OFDM symbol carried by the nth spatial stream to the 2m-th OFDM symbol of the 2n space-time stream; and
- the first mapping module is further configured to map the OFDM symbols respectively carried by the three spatial streams to the six space-time streams when the number of spatial streams in the network is 3.
- the first mapping module is further configured to: map the M OFDM symbols carried in the first spatial stream to the M OFDM symbols of the first space-time stream in the original order of the OFDM symbol;
- the second OFDM symbol of the stream 7 carries the inverse of the conjugate and maps to the first OFDM symbol of the second space-time stream, and maps the first OFDM symbol of the first spatial stream to the conjugate.
- the second OFDM symbol of the two space-time streams is mapped to the third OFDM symbol of the second space-time stream by mapping the fourth OFDM symbol of the first spatial stream to the third OFDM symbol of the second space-time stream.
- the third OFDM symbol of one spatial stream is mapped to the fourth OFDM symbol of the second space-time stream, and the first space is calculated according to the M OFDM symbols of the spatial stream.
- the M-th OFDM symbol of the stream is mapped to the M-1th OFDM symbol of the second space-time stream, and the M-1th OFDM symbol carried by the first spatial stream 7 is taken together.
- the yoke is mapped to the Mth OFDM symbol of the second space-time stream to obtain a second space-time stream; the M OFDM symbols carried in the second space are sequentially mapped to the original order of the OFDM symbol to The inverse of the second spatial stream 7 contained in a second OFDM symbol of the conjugation; 3 M space-time streams of OFDM symbols Mapping the first OFDM symbol of the second spatial stream onto the first OFDM symbol of the fourth space-time stream, and mapping the first OFDM symbol of the second spatial stream to the second OFDM symbol of the fourth space-time stream, The fourth OFDM symbol carried by the second spatial stream takes the inverse of the conjugate and maps to the third OFDM symbol of the fourth space-time stream, and takes the third OFDM symbol of the second spatial stream 7
- the yoke is mapped to the fourth OFDM symbol of the fourth space-time stream, and the M-th OFDM symbol carried by the second spatial stream 7 is conjugated according to the M-OFDM crossover operation method of the spatial stream.
- the opposite number is mapped to the M-1th OFDM symbol of the fourth space-time stream, and the M-1th OFDM symbol of the second spatial stream is conjugated to the Mth of the fourth space-time stream.
- the fourth space-time stream is obtained;
- the M OFDM symbols carried in the third spatial stream 7 are sequentially mapped to the M OFDM symbols of the fifth space-time stream in the original order of the OFDM symbol;
- the second OFDM symbol of the three spatial streams is mapped to the first OFDM symbol of the sixth space-time stream, and the first OFDM symbol of the third spatial stream 7 is conjugated.
- the second OFDM symbol of the space-time stream is mapped to the third OFDM symbol of the sixth space-time stream by mapping the fourth OFDM symbol carried by the third spatial stream 7 to the third OFDM symbol of the sixth OFDM symbol.
- the third OFDM symbol of the three spatial streams 7 is conjugate mapped to the fourth OFDM symbol of the sixth space-time stream, and the third OFDM symbol is used according to the spatial hopping method.
- the M-th OFDM symbol carried by the spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the sixth space-time stream, and takes the M-1th OFDM symbol of the third spatial stream.
- the common eigen is mapped to the Mth OFDM symbol of the sixth space-time stream, and the sixth space-time stream is obtained.
- the first mapping module is further configured to map the orthogonal frequency division multiplexing OFDM symbols respectively carried by the four spatial streams to eight space-time streams when the number of spatial streams in the network is 4.
- the first mapping module is further configured to: map the M OFDM symbols carried by the first spatial stream to the M OFDM symbols of the first space-time stream in the original order of the OFDM symbol;
- the second OFDM symbol of the spatial stream is mapped to the first OFDM symbol of the second space-time stream, and the first OFDM symbol of the first spatial stream 7 is conjugated.
- the fourth OFDM symbol of the first spatial stream carries the inverse of the conjugate to the third OFDM of the second space-time stream
- the third OFDM symbol carried in the first spatial stream is conjugate-mapped to the fourth OFDM symbol of the second space-time stream, and the two OFDM symbols are interleaved according to the spatial stream.
- the first OFDM symbol of the second spatial stream is mapped to the second OFDM symbol of the fourth space-time stream, and the fourth OFDM symbol carried by the second spatial stream is conjugated.
- the opposite number is mapped to the 3rd OFDM symbol of the 4th space-time stream, and the 3rd OFDM symbol of the 2nd spatial stream is conjugate-mapped to the 4th OFDM symbol of the 4th space-time stream
- the M-th OFDM symbol carried by the second spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the fourth space-time stream, where the second spatial stream
- the M-1 OFDM symbols are mapped to the Mth OFDM symbol of the 4th space-time stream to obtain a 4th space-time stream; the M OFDM symbols carried by the 3rd spatial stream are OFDM symbols.
- the order is sequentially mapped to the M OFDM symbols of the 5th space-time stream; the 2nd OFDM symbol carried by the 3rd spatial stream takes the inverse of the conjugate and maps to the 1st of the 6th space-time stream
- the first OFDM symbol carried by the third spatial stream 7 is conjugate mapped to the second OFDM symbol of the sixth space-time stream, and the third spatial stream 7 carries the fourth OFDM symbol.
- the OFDM symbol takes the inverse of the conjugate to the third OFDM symbol of the sixth space-time stream, and the third OFDM symbol of the third spatial stream 7 takes the conjugate to the sixth space.
- the M OFDM symbols of the spatial stream are two-two-crossing operation method, ⁇ !
- the M-th OFDM symbol carried by the third spatial stream 7 takes the inverse of the conjugate and maps to the M-1th OFDM symbol of the sixth space-time stream, where the third spatial stream
- the M-1 OFDM symbols are mapped to the Mth OFDM symbol of the 6th space-time stream to obtain a 6th space-time stream; and the M OFDM symbols of the 4th spatial stream are OFDM symbols.
- the original order is sequentially mapped to the M OFDM symbols of the 7th space-time stream; the 2nd OFDM symbol of the 4th spatial stream takes the opposite of the conjugate to the 8th space-time stream
- the first OFDM symbol of the fourth spatial stream is mapped to the second OFDM symbol of the eighth space-time stream, and the fourth spatial stream 7 carries the first OFDM symbol.
- the inverse of the conjugate of the 4 OFDM symbols is mapped to the 3rd OFDM symbol of the 8th space-time stream, and the 3rd OFDM symbol of the 4th spatial stream 7 is conjugated to the 8th OFDM symbol.
- the 4th OFDM symbol of the current stream according to the method of crossing the M OFDM symbols of the spatial stream, ⁇ !
- the device further includes: a second mapping module, configured to: when the determination result is no, the M OFDM symbols carried in the nth spatial stream 7 are sequentially mapped to the 4th column in the nth spatial stream n space-timed M OFDM symbols.
- the M orthogonal frequency division multiplexing OFDM symbols carried in the n-th spatial stream 7 are respectively mapped to the first 2n-l space-time streams and 2n space-time streams 7-carrier OFDM symbols provide a specific method for spatial-to-space-time stream mapping using space-time coding, which enables data transmission using space-time streams.
- the purpose is achieved such that system performance is improved and no additional overhead is added relative to the related art.
- FIG. 1 is a process flow diagram of a method for spatially flowing to space-time flow mapping according to an embodiment of the present invention
- FIG. 2 is a flowchart of processing of a data transmission method according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of a first structure of a device for spatially flowing to space-time flow mapping according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of a device for mapping a space-time stream generated according to an embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.
- an embodiment of the present invention provides a method for spatially flowing to a space-time flow mapping.
- the processing flow is as shown in FIG. 1 , and includes: Step S 102: determining, according to a space-time coding indicator bit in the network, Space-time coding is used.
- Step S104 When the determination result is yes, mapping M orthogonal frequency division multiplexing (OFDM) symbols carried by the nth spatial stream to the 2n-th space
- OFDM orthogonal frequency division multiplexing
- N is the total number of spatial streams in the network
- M is the number of OFDM symbols carried by each spatial stream
- M is an even number greater than zero.
- the M orthogonal frequency division multiplexing OFDM symbols carried in the n-th spatial stream 7 are respectively mapped to the first 2n-l space-time streams and 2n space-time streams 7-carrier OFDM symbols provide a specific method for spatial-to-space-time stream mapping using space-time coding, which enables data transmission using space-time streams. The purpose is achieved such that system performance is improved and no additional overhead is added relative to the related art. As shown in FIG.
- mapping the OFDM symbol carried by the nth spatial stream to the OFDM symbol of the 2n-1 spatial-timetime bearer may be implemented in multiple manners.
- the method may be, for example, one-to-one mapping, one-to-many mapping, multi-to-one mapping, interlaced mapping, etc., but in the specific implementation, in order to ensure the accuracy of the mapping, the optimal application is adopted.
- the one-to-one mapping for example, can be mapped as follows: The M OFDM symbols carried by the nth spatial stream 7 are sequentially mapped to the 2n-1th in the order of their arrangement in the nth spatial stream. Space-time streams on M OFDM symbols.
- the space-time coding indicator bit in the network can not only indicate the use of space-time coding, but also indicate that space-time coding is not used.
- the mapping method used at this time can be as follows: M of the n-th spatial stream 7
- the OFDM symbols are sequentially mapped onto the Mth OFDM symbols of the nth space-time stream in the order in which they are arranged in the nth spatial stream.
- the spatial flow space-time flow mapping method provided by the embodiment of the present invention is used, in the subsequent data transmission process, the mapped space-time flow can be used for data transmission, thereby improving system performance, that is, based on the same inventive concept,
- the embodiment of the present invention may further provide a data transmission method, where the processing flow is as shown in FIG.
- the MOFDM symbols carried in the n-th spatial stream 7 are respectively mapped to the 2n-th space-time stream and On the OFDM symbol carried by the 2n space-time stream, a specific method for spatial-to-space-time flow mapping using space-time coding is provided, and the 2n-1 space-time streams and the 2n space-times mapped are used.
- the data transmission of the streamed OFDM symbol enables the purpose of data transmission using the space-time stream, thereby improving system performance and adding no additional overhead with respect to the related art.
- each spatial stream has M OFDM symbols, and each OFDM symbol has N effective subcarriers.
- Embodiment 1 For a spatial stream, when the signaling indicates that space-time coding is not used, the M OFDM symbols carried in this spatial stream are sequentially mapped to the M OFDM symbols of the space-time stream in the original order.
- the M OFDM symbols carried by the spatial stream 7 are sequentially mapped to the M OFDM symbols of the first space-time stream in the original order. Then, the second OFDM symbol of the spatial stream is mapped to the first OFDM symbol of the second space-time stream, and the first OFDM symbol carried by the spatial stream is conjugate mapped. On the second OFDM symbol of the second space-time stream, the fourth OFDM symbol carried by the spatial stream 7 is mapped to the third OFDM symbol of the second space-time stream. The third OFDM symbol carried by the spatial stream is mapped to the fourth OFDM symbol of the second space-time stream, and so on, and each two symbols are mapped according to the above method to obtain a second space-time stream. .
- Embodiment 2 For two spatial streams, when the signaling indicates that space-time coding is not used, the M OFDM symbols carried by the two spatial streams 7 are sequentially mapped to M OFDM of two space-time streams in the original order. On the symbol. When the signaling indicates that the space-time coding is used, the M OFDM symbols carried by the first spatial stream are sequentially mapped to the M OFDM symbols of the first space-time stream in the original order. Then, the second OFDM symbol carried by the first spatial stream is mapped to the first OFDM symbol of the second space-time stream, and the first OFDM symbol of the spatial stream is conjugated.
- the third OFDM symbol carried by the spatial stream is conjugated to the fourth OFDM symbol of the second space-time stream, and so on, and each two symbols are mapped according to the above method to obtain the second space time. flow.
- the second spatial stream is also mapped to the 3rd and 4th space-time streams using the above method, and finally 4 space-time streams are obtained.
- Embodiment 3 For three spatial streams, when the signaling indicates that space-time coding is not used, the M OFDM symbols carried by the three spatial streams 7 are sequentially mapped to M OFDM of three space-time streams in the original order. On the symbol.
- the M OFDM symbols carried by the first spatial stream are sequentially mapped to the M OFDM symbols of the first space-time stream in the original order. Then the first space The second OFDM symbol of the stream bearer is mapped to the first OFDM symbol of the second space-time stream, and the first OFDM symbol of the spatial stream is conjugated to the second space.
- the fourth OFDM symbol carried by the spatial stream 7 is mapped to the third OFDM symbol of the second space-time stream, and the spatial stream is carried.
- the third OFDM symbol is conjugate-mapped to the fourth OFDM symbol of the second space-time stream, and so on.
- Each two symbols are mapped according to the above method to obtain a second space-time stream.
- the second spatial stream is also mapped to the 3rd and 4th space-time streams by the above method, and the 3rd spatial stream is also mapped to the 5th and 6th space-time streams by the above method, and finally 6 space-times are obtained.
- Embodiment 4 For four spatial streams, when the signaling indicates that space-time coding is not used, the four spatial streams are carried.
- the M OFDM symbols are sequentially mapped to the M OFDM symbols of the four space-time streams in the original order.
- the M OFDM symbols carried by the first spatial stream are sequentially mapped to the M OFDM symbols of the first space-time stream in the original order.
- the second OFDM symbol carried by the first spatial stream is mapped to the first OFDM symbol of the second space-time stream, and the first OFDM symbol of the spatial stream is conjugated. Mapping the second OFDM symbol of the second space-time stream, and mapping the fourth OFDM symbol carried by the spatial stream 7 to the third OFDM symbol of the second space-time stream.
- the third OFDM symbol carried by the spatial stream is conjugated to the fourth OFDM symbol of the second space-time stream, and so on, and each two symbols are mapped according to the above method to obtain the second space time. flow.
- the second spatial stream is also mapped to the 3rd and 4th space-time streams by the above method
- the third spatial stream is also mapped to the 5th and 6th space-time streams by the above method
- the 4th spatial stream is also ⁇ Map to the 7th and 8th space-time streams using the above method, and finally get 8 space-time streams.
- Embodiment 5 For 5, 6, 7, and 8 spatial streams, space-time coding cannot be used, and the M OFDM symbols of the 5, 6, 7, and 8 spatial streams are sequentially mapped to 5, 6 in the original order. 7, 7 and 8 space-time streams on M OFDM symbols. See Figure 3 for a schematic diagram of the space-time streams generated after the mapping from Embodiment 1 to Embodiment 5 above.
- the data blocks uploaded by the OFDM symbol are D1, D2, D3, D4 D M-3 , D M-2 , D M-1 ,
- the space-time coding indicator of the WLAN is used to determine whether space-time coding is used
- the STBC field in the VHT-SIG-A signaling may be used as the space-time coding indicator bit, and for different streams, when VHT - When the STBC field in SIG-A is set to 0, it means that space-time coding is not used. When set to 1, it means that space-time coding is used.
- Table 1 The specific mapping of space-time coding is shown in Table 1:
- ⁇ is the number of empty time streams
- ⁇ ⁇ is the number of spatial streams
- z is the first few space-time streams
- "represents the corresponding data on each valid subcarrier of each OFDM symbol of each spatial stream, where k 0 , 1,
- the STBC field in the VHT-SIG-A is only a preferred embodiment as a space-time coding indicator. It is not limited to the STBC field in the VHT-SIG-A. Other signaling can be selected according to the actual situation. Or the field is used as a space-time coded indication bit.
- the first mapping module 402 can also be configured to carry the nth spatial stream.
- the M OFDM symbols are sequentially mapped onto the M OFDM symbols of the 2n-1th space-time stream in the order in which they are arranged in the nth spatial stream.
- the apparatus for spatially flowing to the space-time flow mapping may further include: a second mapping module 501, configured to: when the determination result is no, the M OFDMs carried by the nth spatial stream The symbols are sequentially mapped onto the OFDM OFDM symbols of the nth space-time stream in the order in which they are arranged in the nth spatial stream.
- a second mapping module 501 configured to: when the determination result is no, the M OFDMs carried by the nth spatial stream The symbols are sequentially mapped onto the OFDM OFDM symbols of the nth space-time stream in the order in which they are arranged in the nth spatial stream.
- the second judging module 601 is configured to determine whether to use the space time coding according to the space time coding indicator bit in the network;
- the data transmission module 603 is configured to perform the OFDM symbols carried by the 2n-l space-time streams and the 2n-time space-time streams 7 to be mapped. data transmission.
- the third mapping module 602 may be further configured to: when the determination result is no, the nth OFDM symbols carried by the nth spatial stream are sequentially mapped to the nth in the order of the nth spatial streams.
- the data transmission module 603 can also be configured to perform data transmission with the OFDM symbol carried by the nth space-time stream 7 mapped to the space. From the above description, it can be seen that the present invention achieves the following technical effects: In the embodiment of the present invention, when the space-time coding indicator bit in the network is used to determine the space-time coding, the n-th space is used.
- the M orthogonal frequency division multiplexing OFDM symbols of the stream 7 are respectively mapped to the OFDM symbols of the 2n-1th space-time stream and the 2nth space-time stream 7 respectively, and provide space-time coding by using space-time coding to
- the specific method of the space-time flow mapping enables the purpose of data transmission using the space-time stream, thereby improving the system performance and adding no additional overhead with respect to the related art.
- the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
- the invention is not limited to any specific combination of hardware and software.
- the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.
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- Engineering & Computer Science (AREA)
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- Compression Or Coding Systems Of Tv Signals (AREA)
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US13/979,520 US9247545B2 (en) | 2011-01-14 | 2011-06-28 | Method and device for mapping spatial stream to space time stream, and method and device for transmitting data |
EP11855448.4A EP2665202A4 (en) | 2011-01-14 | 2011-06-28 | Method and device for mapping spatial stream to space time stream, and data transmission method and device |
BR112013018063-3A BR112013018063B1 (pt) | 2011-01-14 | 2011-06-28 | Método e dispositivo para mapeamento de corrente espacial em corrente de espaço- tempo |
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CN201110007980.4 | 2011-01-14 | ||
CN201110007980.4A CN102594488B (zh) | 2011-01-14 | 2011-01-14 | 空间流向空时流映射的方法、装置及数据传输方法、装置 |
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WO2012094877A1 true WO2012094877A1 (zh) | 2012-07-19 |
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US (1) | US9247545B2 (zh) |
EP (1) | EP2665202A4 (zh) |
CN (1) | CN102594488B (zh) |
BR (1) | BR112013018063B1 (zh) |
WO (1) | WO2012094877A1 (zh) |
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US20170265217A1 (en) * | 2016-03-09 | 2017-09-14 | Intel Corporation | Apparatus, system and method of communicating pilot signals according to a diversity scheme |
US11290211B2 (en) | 2016-03-09 | 2022-03-29 | Intel Corporation | Apparatus, system and method of communicating a transmission according to a space-time encoding scheme |
Citations (3)
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CN1841962A (zh) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | 发送系统和方法及接收系统和方法 |
CN101056132A (zh) * | 2006-04-13 | 2007-10-17 | 上海贝尔阿尔卡特股份有限公司 | 用于空时/空频/空间分集发射机基带处理的方法及装置 |
WO2009157734A2 (en) * | 2008-06-26 | 2009-12-30 | Lg Electronics Inc. | Apparatus and method for data transmission using transmit diversity in sc-fdma system |
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US7664194B2 (en) * | 2005-12-20 | 2010-02-16 | Samsung Electronics Co., Ltd. | Combining space time block code (STBC) with spatial multiplexing for MIMO transmission |
TWI431990B (zh) * | 2006-01-11 | 2014-03-21 | Interdigital Tech Corp | 以不等調變及編碼方法實施空時處理方法及裝置 |
WO2007100317A1 (en) * | 2006-02-28 | 2007-09-07 | Mitsubishi Electric Research Laboratories | Mapping for mimo communication apparatus |
CN101207597B (zh) * | 2006-12-20 | 2011-05-11 | 北京新岸线无线技术有限公司 | 超高速多输入多输出ofdm无线局域网的实现方法与系统 |
US20090232252A1 (en) * | 2008-03-14 | 2009-09-17 | Dukhyun Kim | Method and Apparatus for Digital Encoding with Reduced Memory Requirement and Complexity |
EP2107707B1 (en) * | 2008-03-31 | 2017-08-23 | Google Technology Holdings LLC | Spatial mapping of an OFDM signal to reduce attenuation from an individual transmit antenna in a mimo transmitter |
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2011
- 2011-01-14 CN CN201110007980.4A patent/CN102594488B/zh active Active
- 2011-06-28 WO PCT/CN2011/076530 patent/WO2012094877A1/zh active Application Filing
- 2011-06-28 US US13/979,520 patent/US9247545B2/en active Active
- 2011-06-28 EP EP11855448.4A patent/EP2665202A4/en not_active Ceased
- 2011-06-28 BR BR112013018063-3A patent/BR112013018063B1/pt active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1841962A (zh) * | 2005-03-30 | 2006-10-04 | 松下电器产业株式会社 | 发送系统和方法及接收系统和方法 |
CN101056132A (zh) * | 2006-04-13 | 2007-10-17 | 上海贝尔阿尔卡特股份有限公司 | 用于空时/空频/空间分集发射机基带处理的方法及装置 |
WO2009157734A2 (en) * | 2008-06-26 | 2009-12-30 | Lg Electronics Inc. | Apparatus and method for data transmission using transmit diversity in sc-fdma system |
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Publication number | Publication date |
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US20130294534A1 (en) | 2013-11-07 |
CN102594488B (zh) | 2017-12-19 |
BR112013018063A2 (pt) | 2020-10-27 |
EP2665202A4 (en) | 2017-06-28 |
US9247545B2 (en) | 2016-01-26 |
BR112013018063B1 (pt) | 2022-02-08 |
CN102594488A (zh) | 2012-07-18 |
EP2665202A1 (en) | 2013-11-20 |
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